Background image (movieclip) final render appears flipped
Thank you to the people that replied. 

OK, so the issue was that i had an object made linked to my video, when I created it i had flipped the horizon. I worked on some other objects, worked on camera tracking as well(in other words forgot about that object). When I remembered I had this object i hide it and flipped the backdrop image to its original horizon. So, when I was rendering the hide element was showing.

Yay!!